razf.c

   1 /*
   2  * RAZF : Random Access compressed(Z) File
   3  * Version: 1.0
   4  * Release Date: 2008-10-27
   5  *
   6  * Copyright 2008, Jue Ruan <ruanjue@gmail.com>, Heng Li <lh3@sanger.ac.uk>
   7  *
   8  * All rights reserved.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #ifndef _NO_RAZF
  33
  34 #include <fcntl.h>
  35 #include <stdio.h>
  36 #include <stdlib.h>
  37 #include <string.h>
  38 #include <unistd.h>
  39 #include "razf.h"
  40
  41 #if ZLIB_VERNUM < 0x1221
  42 struct _gz_header_s {
  43     int     text;
  44     uLong   time;
  45     int     xflags;
  46     int     os;
  47     Bytef   *extra;
  48     uInt    extra_len;
  49     uInt    extra_max;
  50     Bytef   *name;
  51     uInt    name_max;
  52     Bytef   *comment;
  53     uInt    comm_max;
  54     int     hcrc;
  55     int     done;
  56 };
  57 #warning "zlib < 1.2.2.1; RAZF writing is disabled."
  58 #endif
  59
  60 #define DEF_MEM_LEVEL 8
  61
  62 static inline uint32_t byte_swap_4(uint32_t v){
  63         v = ((v & 0x0000FFFFU) << 16) | (v >> 16);
  64         return ((v & 0x00FF00FFU) << 8) | ((v & 0xFF00FF00U) >> 8);
  65 }
  66
  67 static inline uint64_t byte_swap_8(uint64_t v){
  68         v = ((v & 0x00000000FFFFFFFFLLU) << 32) | (v >> 32);
  69         v = ((v & 0x0000FFFF0000FFFFLLU) << 16) | ((v & 0xFFFF0000FFFF0000LLU) >> 16);
  70         return ((v & 0x00FF00FF00FF00FFLLU) << 8) | ((v & 0xFF00FF00FF00FF00LLU) >> 8);
  71 }
  72
  73 static inline int is_big_endian(){
  74         int x = 0x01;
  75         char *c = (char*)&x;
  76         return (c[0] != 0x01);
  77 }
  78
  79 #ifndef _RZ_READONLY
  80 static void add_zindex(RAZF *rz, int64_t in, int64_t out){
  81         if(rz->index->size == rz->index->cap){
  82                 rz->index->cap = rz->index->cap * 1.5 + 2;
  83                 rz->index->cell_offsets = realloc(rz->index->cell_offsets, sizeof(int) * rz->index->cap);
  84                 rz->index->bin_offsets  = realloc(rz->index->bin_offsets, sizeof(int64_t) * (rz->index->cap/RZ_BIN_SIZE + 1));
  85         }
  86         if(rz->index->size % RZ_BIN_SIZE == 0) rz->index->bin_offsets[rz->index->size / RZ_BIN_SIZE] = out;
  87         rz->index->cell_offsets[rz->index->size] = out - rz->index->bin_offsets[rz->index->size / RZ_BIN_SIZE];
  88         rz->index->size ++;
  89 }
  90
  91 static void save_zindex(RAZF *rz, int fd){
  92         int32_t i, v32;
  93         int is_be;
  94         is_be = is_big_endian();
  95         if(is_be) write(fd, &rz->index->size, sizeof(int));
  96         else {
  97                 v32 = byte_swap_4((uint32_t)rz->index->size);
  98                 write(fd, &v32, sizeof(uint32_t));
  99         }
 100         v32 = rz->index->size / RZ_BIN_SIZE + 1;
 101         if(!is_be){
 102                 for(i=0;i<v32;i++) rz->index->bin_offsets[i]  = byte_swap_8((uint64_t)rz->index->bin_offsets[i]);
 103                 for(i=0;i<rz->index->size;i++) rz->index->cell_offsets[i] = byte_swap_4((uint32_t)rz->index->cell_offsets[i]);
 104         }
 105         write(fd, rz->index->bin_offsets, sizeof(int64_t) * v32);
 106         write(fd, rz->index->cell_offsets, sizeof(int32_t) * rz->index->size);
 107 }
 108 #endif
 109
 110 static void load_zindex(RAZF *rz, int fd){
 111         int32_t i, v32;
 112         int is_be;
 113         if(!rz->load_index) return;
 114         if(rz->index == NULL) rz->index = malloc(sizeof(ZBlockIndex));
 115         is_be = is_big_endian();
 116         read(fd, &rz->index->size, sizeof(int));
 117         if(!is_be) rz->index->size = byte_swap_4((uint32_t)rz->index->size);
 118         rz->index->cap = rz->index->size;
 119         v32 = rz->index->size / RZ_BIN_SIZE + 1;
 120         rz->index->bin_offsets  = malloc(sizeof(int64_t) * v32);
 121         read(fd, rz->index->bin_offsets, sizeof(int64_t) * v32);
 122         rz->index->cell_offsets = malloc(sizeof(int) * rz->index->size);
 123         read(fd, rz->index->cell_offsets, sizeof(int) * rz->index->size);
 124         if(!is_be){
 125                 for(i=0;i<v32;i++) rz->index->bin_offsets[i] = byte_swap_8((uint64_t)rz->index->bin_offsets[i]);
 126                 for(i=0;i<rz->index->size;i++) rz->index->cell_offsets[i] = byte_swap_4((uint32_t)rz->index->cell_offsets[i]);
 127         }
 128 }
 129
 130 #ifdef _RZ_READONLY
 131 static RAZF* razf_open_w(int fd)
 132 {
 133         fprintf(stderr, "[razf_open_w] Writing is not available with zlib ver < 1.2.2.1\n");
 134         return 0;
 135 }
 136 #else
 137 static RAZF* razf_open_w(int fd){
 138         RAZF *rz;
 139 #ifdef _WIN32
 140         setmode(fd, O_BINARY);
 141 #endif
 142         rz = calloc(1, sizeof(RAZF));
 143         rz->mode = 'w';
 144         rz->filedes = fd;
 145         rz->stream = calloc(sizeof(z_stream), 1);
 146         rz->inbuf  = malloc(RZ_BUFFER_SIZE);
 147         rz->outbuf = malloc(RZ_BUFFER_SIZE);
 148         rz->index = calloc(sizeof(ZBlockIndex), 1);
 149         deflateInit2(rz->stream, RZ_COMPRESS_LEVEL, Z_DEFLATED, WINDOW_BITS + 16, DEF_MEM_LEVEL, Z_DEFAULT_STRATEGY);
 150         rz->stream->avail_out = RZ_BUFFER_SIZE;
 151         rz->stream->next_out  = rz->outbuf;
 152         rz->header = calloc(sizeof(gz_header), 1);
 153         rz->header->os    = 0x03; //Unix
 154         rz->header->text  = 0;
 155         rz->header->time  = 0;
 156         rz->header->extra = malloc(7);
 157         strncpy((char*)rz->header->extra, "RAZF", 4);
 158         rz->header->extra[4] = 1; // obsolete field
 159         // block size = RZ_BLOCK_SIZE, Big-Endian
 160         rz->header->extra[5] = RZ_BLOCK_SIZE >> 8;
 161         rz->header->extra[6] = RZ_BLOCK_SIZE & 0xFF;
 162         rz->header->extra_len = 7;
 163         rz->header->name = rz->header->comment  = 0;
 164         rz->header->hcrc = 0;
 165         deflateSetHeader(rz->stream, rz->header);
 166         rz->block_pos = rz->block_off = 0;
 167         return rz;
 168 }
 169
 170 static void _razf_write(RAZF* rz, const void *data, int size){
 171         int tout;
 172         rz->stream->avail_in = size;
 173         rz->stream->next_in  = (void*)data;
 174         while(1){
 175                 tout = rz->stream->avail_out;
 176                 deflate(rz->stream, Z_NO_FLUSH);
 177                 rz->out += tout - rz->stream->avail_out;
 178                 if(rz->stream->avail_out) break;
 179                 write(rz->filedes, rz->outbuf, RZ_BUFFER_SIZE - rz->stream->avail_out);
 180                 rz->stream->avail_out = RZ_BUFFER_SIZE;
 181                 rz->stream->next_out  = rz->outbuf;
 182                 if(rz->stream->avail_in == 0) break;
 183         };
 184         rz->in += size - rz->stream->avail_in;
 185         rz->block_off += size - rz->stream->avail_in;
 186 }
 187
 188 static void razf_flush(RAZF *rz){
 189         uint32_t tout;
 190         if(rz->buf_len){
 191                 _razf_write(rz, rz->inbuf, rz->buf_len);
 192                 rz->buf_off = rz->buf_len = 0;
 193         }
 194         if(rz->stream->avail_out){
 195                 write(rz->filedes, rz->outbuf, RZ_BUFFER_SIZE - rz->stream->avail_out);
 196                 rz->stream->avail_out = RZ_BUFFER_SIZE;
 197                 rz->stream->next_out  = rz->outbuf;
 198         }
 199         while(1){
 200                 tout = rz->stream->avail_out;
 201                 deflate(rz->stream, Z_FULL_FLUSH);
 202                 rz->out += tout - rz->stream->avail_out;
 203                 if(rz->stream->avail_out == 0){
 204                         write(rz->filedes, rz->outbuf, RZ_BUFFER_SIZE - rz->stream->avail_out);
 205                         rz->stream->avail_out = RZ_BUFFER_SIZE;
 206                         rz->stream->next_out  = rz->outbuf;
 207                 } else break;
 208         }
 209         rz->block_pos = rz->out;
 210         rz->block_off = 0;
 211 }
 212
 213 static void razf_end_flush(RAZF *rz){
 214         uint32_t tout;
 215         if(rz->buf_len){
 216                 _razf_write(rz, rz->inbuf, rz->buf_len);
 217                 rz->buf_off = rz->buf_len = 0;
 218         }
 219         while(1){
 220                 tout = rz->stream->avail_out;
 221                 deflate(rz->stream, Z_FINISH);
 222                 rz->out += tout - rz->stream->avail_out;
 223                 if(rz->stream->avail_out < RZ_BUFFER_SIZE){
 224                         write(rz->filedes, rz->outbuf, RZ_BUFFER_SIZE - rz->stream->avail_out);
 225                         rz->stream->avail_out = RZ_BUFFER_SIZE;
 226                         rz->stream->next_out  = rz->outbuf;
 227                 } else break;
 228         }
 229 }
 230
 231 static void _razf_buffered_write(RAZF *rz, const void *data, int size){
 232         int i, n;
 233         while(1){
 234                 if(rz->buf_len == RZ_BUFFER_SIZE){
 235                         _razf_write(rz, rz->inbuf, rz->buf_len);
 236                         rz->buf_len = 0;
 237                 }
 238                 if(size + rz->buf_len < RZ_BUFFER_SIZE){
 239                         for(i=0;i<size;i++) ((char*)rz->inbuf + rz->buf_len)[i] = ((char*)data)[i];
 240                         rz->buf_len += size;
 241                         return;
 242                 } else {
 243                         n = RZ_BUFFER_SIZE - rz->buf_len;
 244                         for(i=0;i<n;i++) ((char*)rz->inbuf + rz->buf_len)[i] = ((char*)data)[i];
 245                         size -= n;
 246                         data += n;
 247                         rz->buf_len += n;
 248                 }
 249         }
 250 }
 251
 252 int razf_write(RAZF* rz, const void *data, int size){
 253         int ori_size, n;
 254         int64_t next_block;
 255         ori_size = size;
 256         next_block = ((rz->in / RZ_BLOCK_SIZE) + 1) * RZ_BLOCK_SIZE;
 257         while(rz->in + rz->buf_len + size >= next_block){
 258                 n = next_block - rz->in - rz->buf_len;
 259                 _razf_buffered_write(rz, data, n);
 260                 data += n;
 261                 size -= n;
 262                 razf_flush(rz);
 263                 add_zindex(rz, rz->in, rz->out);
 264                 next_block = ((rz->in / RZ_BLOCK_SIZE) + 1) * RZ_BLOCK_SIZE;
 265         }
 266         _razf_buffered_write(rz, data, size);
 267         return ori_size;
 268 }
 269 #endif
 270
 271 /* gzip flag byte */
 272 #define ASCII_FLAG   0x01 /* bit 0 set: file probably ascii text */
 273 #define HEAD_CRC     0x02 /* bit 1 set: header CRC present */
 274 #define EXTRA_FIELD  0x04 /* bit 2 set: extra field present */
 275 #define ORIG_NAME    0x08 /* bit 3 set: original file name present */
 276 #define COMMENT      0x10 /* bit 4 set: file comment present */
 277 #define RESERVED     0xE0 /* bits 5..7: reserved */
 278
 279 static int _read_gz_header(unsigned char *data, int size, int *extra_off, int *extra_len){
 280         int method, flags, n, len;
 281         if(size < 2) return 0;
 282         if(data[0] != 0x1f || data[1] != 0x8b) return 0;
 283         if(size < 4) return 0;
 284         method = data[2];
 285         flags  = data[3];
 286         if(method != Z_DEFLATED || (flags & RESERVED)) return 0;
 287         n = 4 + 6; // Skip 6 bytes
 288         *extra_off = n + 2;
 289         *extra_len = 0;
 290         if(flags & EXTRA_FIELD){
 291                 if(size < n + 2) return 0;
 292                 len = ((int)data[n + 1] << 8) | data[n];
 293                 n += 2;
 294                 *extra_off = n;
 295                 while(len){
 296                         if(n >= size) return 0;
 297                         n ++;
 298                         len --;
 299                 }
 300                 *extra_len = n - (*extra_off);
 301         }
 302         if(flags & ORIG_NAME) while(n < size && data[n++]);
 303         if(flags & COMMENT) while(n < size && data[n++]);
 304         if(flags & HEAD_CRC){
 305                 if(n + 2 > size) return 0;
 306                 n += 2;
 307         }
 308         return n;
 309 }
 310
 311 static RAZF* razf_open_r(int fd, int _load_index){
 312         RAZF *rz;
 313         int ext_off, ext_len;
 314         int n, is_be, ret;
 315         int64_t end;
 316         unsigned char c[] = "RAZF";
 317 #ifdef _WIN32
 318         setmode(fd, O_BINARY);
 319 #endif
 320         rz = calloc(1, sizeof(RAZF));
 321         rz->mode = 'r';
 322         rz->filedes = fd;
 323         rz->stream = calloc(sizeof(z_stream), 1);
 324         rz->inbuf  = malloc(RZ_BUFFER_SIZE);
 325         rz->outbuf = malloc(RZ_BUFFER_SIZE);
 326         rz->end = rz->src_end = 0x7FFFFFFFFFFFFFFFLL;
 327         n = read(rz->filedes, rz->inbuf, RZ_BUFFER_SIZE);
 328         ret = _read_gz_header(rz->inbuf, n, &ext_off, &ext_len);
 329         if(ret == 0){
 330                 PLAIN_FILE:
 331                 rz->in = n;
 332                 rz->file_type = FILE_TYPE_PLAIN;
 333                 memcpy(rz->outbuf, rz->inbuf, n);
 334                 rz->buf_len = n;
 335                 free(rz->stream);
 336                 rz->stream = NULL;
 337                 return rz;
 338         }
 339         rz->header_size = ret;
 340         ret = inflateInit2(rz->stream, -WINDOW_BITS);
 341         if(ret != Z_OK){ inflateEnd(rz->stream); goto PLAIN_FILE;}
 342         rz->stream->avail_in = n - rz->header_size;
 343         rz->stream->next_in  = rz->inbuf + rz->header_size;
 344         rz->stream->avail_out = RZ_BUFFER_SIZE;
 345         rz->stream->next_out  = rz->outbuf;
 346         rz->file_type = FILE_TYPE_GZ;
 347         rz->in = rz->header_size;
 348         rz->block_pos = rz->header_size;
 349         rz->next_block_pos = rz->header_size;
 350         rz->block_off = 0;
 351         if(ext_len < 7 || memcmp(rz->inbuf + ext_off, c, 4) != 0) return rz;
 352         if(((((unsigned char*)rz->inbuf)[ext_off + 5] << 8) | ((unsigned char*)rz->inbuf)[ext_off + 6]) != RZ_BLOCK_SIZE){
 353                 fprintf(stderr, " -- WARNING: RZ_BLOCK_SIZE is not %d, treat source as gz file.  in %s -- %s:%d --\n", RZ_BLOCK_SIZE, __FUNCTION__, __FILE__, __LINE__);
 354                 return rz;
 355         }
 356         rz->load_index = _load_index;
 357         rz->file_type = FILE_TYPE_RZ;
 358         if(lseek(fd, -16, SEEK_END) == -1){
 359                 UNSEEKABLE:
 360                 rz->seekable = 0;
 361                 rz->index = NULL;
 362                 rz->src_end = rz->end = 0x7FFFFFFFFFFFFFFFLL;
 363         } else {
 364                 is_be = is_big_endian();
 365                 rz->seekable = 1;
 366                 read(fd, &end, sizeof(int64_t));
 367                 if(!is_be) rz->src_end = (int64_t)byte_swap_8((uint64_t)end);
 368                 else rz->src_end = end;
 369                 read(fd, &end, sizeof(int64_t));
 370                 if(!is_be) rz->end = (int64_t)byte_swap_8((uint64_t)end);
 371                 else rz->end = end;
 372                 if(n > rz->end){
 373                         rz->stream->avail_in -= n - rz->end;
 374                         n = rz->end;
 375                 }
 376                 if(rz->end > rz->src_end){
 377                         lseek(fd, rz->in, SEEK_SET);
 378                         goto UNSEEKABLE;
 379                 }
 380                 if(lseek(fd, rz->end, SEEK_SET) != rz->end){
 381                         lseek(fd, rz->in, SEEK_SET);
 382                         goto UNSEEKABLE;
 383                 }
 384                 load_zindex(rz, fd);
 385                 lseek(fd, n, SEEK_SET);
 386         }
 387         return rz;
 388 }
 389
 390 RAZF* razf_dopen(int fd, const char *mode){
 391         if(strstr(mode, "r")) return razf_open_r(fd, 1);
 392         else if(strstr(mode, "w")) return razf_open_w(fd);
 393         else return NULL;
 394 }
 395
 396 RAZF* razf_dopen2(int fd, const char *mode)
 397 {
 398         if(strstr(mode, "r")) return razf_open_r(fd, 0);
 399         else if(strstr(mode, "w")) return razf_open_w(fd);
 400         else return NULL;
 401 }
 402
 403 static inline RAZF* _razf_open(const char *filename, const char *mode, int _load_index){
 404         int fd;
 405         RAZF *rz;
 406         if(strstr(mode, "r")){
 407 #ifdef _WIN32
 408                 fd = open(filename, O_RDONLY | O_BINARY);
 409 #else
 410                 fd = open(filename, O_RDONLY);
 411 #endif
 412                 if(fd < 0) return NULL;
 413                 rz = razf_open_r(fd, _load_index);
 414         } else if(strstr(mode, "w")){
 415 #ifdef _WIN32
 416                 fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, 0644);
 417 #else
 418                 fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0644);
 419 #endif
 420                 if(fd < 0) return NULL;
 421                 rz = razf_open_w(fd);
 422         } else return NULL;
 423         return rz;
 424 }
 425
 426 RAZF* razf_open(const char *filename, const char *mode){
 427         return _razf_open(filename, mode, 1);
 428 }
 429
 430 RAZF* razf_open2(const char *filename, const char *mode){
 431         return _razf_open(filename, mode, 0);
 432 }
 433
 434 int razf_get_data_size(RAZF *rz, int64_t *u_size, int64_t *c_size){
 435         int64_t n;
 436         if(rz->mode != 'r' && rz->mode != 'R') return 0;
 437         switch(rz->file_type){
 438                 case FILE_TYPE_PLAIN:
 439                         if(rz->end == 0x7fffffffffffffffLL){
 440                                 if((n = lseek(rz->filedes, 0, SEEK_CUR)) == -1) return 0;
 441                                 rz->end = lseek(rz->filedes, 0, SEEK_END);
 442                                 lseek(rz->filedes, n, SEEK_SET);
 443                         }
 444                         *u_size = *c_size = rz->end;
 445                         return 1;
 446                 case FILE_TYPE_GZ:
 447                         return 0;
 448                 case FILE_TYPE_RZ:
 449                         if(rz->src_end == rz->end) return 0;
 450                         *u_size = rz->src_end;
 451                         *c_size = rz->end;
 452                         return 1;
 453                 default:
 454                         return 0;
 455         }
 456 }
 457
 458 static int _razf_read(RAZF* rz, void *data, int size){
 459         int ret, tin;
 460         if(rz->z_eof || rz->z_err) return 0;
 461         if (rz->file_type == FILE_TYPE_PLAIN) {
 462                 ret = read(rz->filedes, data, size);
 463                 if (ret == 0) rz->z_eof = 1;
 464                 return ret;
 465         }
 466         rz->stream->avail_out = size;
 467         rz->stream->next_out  = data;
 468         while(rz->stream->avail_out){
 469                 if(rz->stream->avail_in == 0){
 470                         if(rz->in >= rz->end){ rz->z_eof = 1; break; }
 471                         if(rz->end - rz->in < RZ_BUFFER_SIZE){
 472                                 rz->stream->avail_in = read(rz->filedes, rz->inbuf, rz->end -rz->in);
 473                         } else {
 474                                 rz->stream->avail_in = read(rz->filedes, rz->inbuf, RZ_BUFFER_SIZE);
 475                         }
 476                         if(rz->stream->avail_in == 0){
 477                                 rz->z_eof = 1;
 478                                 break;
 479                         }
 480                         rz->stream->next_in = rz->inbuf;
 481                 }
 482                 tin = rz->stream->avail_in;
 483                 ret = inflate(rz->stream, Z_BLOCK);
 484                 rz->in += tin - rz->stream->avail_in;
 485                 if(ret == Z_NEED_DICT || ret == Z_MEM_ERROR || ret == Z_DATA_ERROR){
 486                         fprintf(stderr, "[_razf_read] inflate error: %d (at %s:%d)\n", ret, __FILE__, __LINE__);
 487                         rz->z_err = 1;
 488                         break;
 489                 }
 490                 if(ret == Z_STREAM_END){
 491                         rz->z_eof = 1;
 492                         break;
 493                 }
 494                 if ((rz->stream->data_type&128) && !(rz->stream->data_type&64)){
 495                         rz->buf_flush = 1;
 496                         rz->next_block_pos = rz->in;
 497                         break;
 498                 }
 499         }
 500         return size - rz->stream->avail_out;
 501 }
 502
 503 int razf_read(RAZF *rz, void *data, int size){
 504         int ori_size, i;
 505         ori_size = size;
 506         while(size > 0){
 507                 if(rz->buf_len){
 508                         if(size < rz->buf_len){
 509                                 for(i=0;i<size;i++) ((char*)data)[i] = ((char*)rz->outbuf + rz->buf_off)[i];
 510                                 rz->buf_off += size;
 511                                 rz->buf_len -= size;
 512                                 data += size;
 513                                 rz->block_off += size;
 514                                 size = 0;
 515                                 break;
 516                         } else {
 517                                 for(i=0;i<rz->buf_len;i++) ((char*)data)[i] = ((char*)rz->outbuf + rz->buf_off)[i];
 518                                 data += rz->buf_len;
 519                                 size -= rz->buf_len;
 520                                 rz->block_off += rz->buf_len;
 521                                 rz->buf_off = 0;
 522                                 rz->buf_len = 0;
 523                                 if(rz->buf_flush){
 524                                         rz->block_pos = rz->next_block_pos;
 525                                         rz->block_off = 0;
 526                                         rz->buf_flush = 0;
 527                                 }
 528                         }
 529                 } else if(rz->buf_flush){
 530                         rz->block_pos = rz->next_block_pos;
 531                         rz->block_off = 0;
 532                         rz->buf_flush = 0;
 533                 }
 534                 if(rz->buf_flush) continue;
 535                 rz->buf_len = _razf_read(rz, rz->outbuf, RZ_BUFFER_SIZE);
 536                 if(rz->z_eof && rz->buf_len == 0) break;
 537         }
 538         rz->out += ori_size - size;
 539         return ori_size - size;
 540 }
 541
 542 int razf_skip(RAZF* rz, int size){
 543         int ori_size;
 544         ori_size = size;
 545         while(size > 0){
 546                 if(rz->buf_len){
 547                         if(size < rz->buf_len){
 548                                 rz->buf_off += size;
 549                                 rz->buf_len -= size;
 550                                 rz->block_off += size;
 551                                 size = 0;
 552                                 break;
 553                         } else {
 554                                 size -= rz->buf_len;
 555                                 rz->buf_off = 0;
 556                                 rz->buf_len = 0;
 557                                 rz->block_off += rz->buf_len;
 558                                 if(rz->buf_flush){
 559                                         rz->block_pos = rz->next_block_pos;
 560                                         rz->block_off = 0;
 561                                         rz->buf_flush = 0;
 562                                 }
 563                         }
 564                 } else if(rz->buf_flush){
 565                         rz->block_pos = rz->next_block_pos;
 566                         rz->block_off = 0;
 567                         rz->buf_flush = 0;
 568                 }
 569                 if(rz->buf_flush) continue;
 570                 rz->buf_len = _razf_read(rz, rz->outbuf, RZ_BUFFER_SIZE);
 571                 if(rz->z_eof) break;
 572         }
 573         rz->out += ori_size - size;
 574         return ori_size - size;
 575 }
 576
 577 static void _razf_reset_read(RAZF *rz, int64_t in, int64_t out){
 578         lseek(rz->filedes, in, SEEK_SET);
 579         rz->in  = in;
 580         rz->out = out;
 581         rz->block_pos = in;
 582         rz->next_block_pos = in;
 583         rz->block_off = 0;
 584         rz->buf_flush = 0;
 585         rz->z_eof = rz->z_err = 0;
 586         inflateReset(rz->stream);
 587         rz->stream->avail_in = 0;
 588         rz->buf_off = rz->buf_len = 0;
 589 }
 590
 591 int64_t razf_jump(RAZF *rz, int64_t block_start, int block_offset){
 592         int64_t pos;
 593         rz->z_eof = 0;
 594         if(rz->file_type == FILE_TYPE_PLAIN){
 595                 rz->buf_off = rz->buf_len = 0;
 596                 pos = block_start + block_offset;
 597                 pos = lseek(rz->filedes, pos, SEEK_SET);
 598                 rz->out = rz->in = pos;
 599                 return pos;
 600         }
 601         if(block_start == rz->block_pos && block_offset >= rz->block_off) {
 602                 block_offset -= rz->block_off;
 603                 goto SKIP; // Needn't reset inflate
 604         }
 605         if(block_start  == 0) block_start = rz->header_size; // Automaticly revist wrong block_start
 606         _razf_reset_read(rz, block_start, 0);
 607         SKIP:
 608         if(block_offset) razf_skip(rz, block_offset);
 609         return rz->block_off;
 610 }
 611
 612 int64_t razf_seek(RAZF* rz, int64_t pos, int where){
 613         int64_t idx;
 614         int64_t seek_pos, new_out;
 615         rz->z_eof = 0;
 616         if (where == SEEK_CUR) pos += rz->out;
 617         else if (where == SEEK_END) pos += rz->src_end;
 618         if(rz->file_type == FILE_TYPE_PLAIN){
 619                 seek_pos = lseek(rz->filedes, pos, SEEK_SET);
 620                 rz->buf_off = rz->buf_len = 0;
 621                 rz->out = rz->in = seek_pos;
 622                 return seek_pos;
 623         } else if(rz->file_type == FILE_TYPE_GZ){
 624                 if(pos >= rz->out) goto SKIP;
 625                 return rz->out;
 626         }
 627         if(pos == rz->out) return pos;
 628         if(pos > rz->src_end) return rz->out;
 629         if(!rz->seekable || !rz->load_index){
 630                 if(pos >= rz->out) goto SKIP;
 631         }
 632         idx = pos / RZ_BLOCK_SIZE - 1;
 633         seek_pos = (idx < 0)? rz->header_size:(rz->index->cell_offsets[idx] + rz->index->bin_offsets[idx / RZ_BIN_SIZE]);
 634         new_out  = (idx + 1) * RZ_BLOCK_SIZE;
 635         if(pos > rz->out && new_out <= rz->out) goto SKIP;
 636         _razf_reset_read(rz, seek_pos, new_out);
 637         SKIP:
 638         razf_skip(rz, (int)(pos - rz->out));
 639         return rz->out;
 640 }
 641
 642 uint64_t razf_tell2(RAZF *rz)
 643 {
 644         /*
 645         if (rz->load_index) {
 646                 int64_t idx, seek_pos;
 647                 idx = rz->out / RZ_BLOCK_SIZE - 1;
 648                 seek_pos = (idx < 0)? rz->header_size:(rz->index->cell_offsets[idx] + rz->index->bin_offsets[idx / RZ_BIN_SIZE]);
 649                 if (seek_pos != rz->block_pos || rz->out%RZ_BLOCK_SIZE != rz->block_off)
 650                         fprintf(stderr, "[razf_tell2] inconsistent block offset: (%lld, %lld) != (%lld, %lld)\n",
 651                                         (long long)seek_pos, (long long)rz->out%RZ_BLOCK_SIZE, (long long)rz->block_pos, (long long) rz->block_off);
 652         }
 653         */
 654         return (uint64_t)rz->block_pos<<16 | (rz->block_off&0xffff);
 655 }
 656
 657 int64_t razf_seek2(RAZF *rz, uint64_t voffset, int where)
 658 {
 659         if (where != SEEK_SET) return -1;
 660         return razf_jump(rz, voffset>>16, voffset&0xffff);
 661 }
 662
 663 void razf_close(RAZF *rz){
 664         if(rz->mode == 'w'){
 665 #ifndef _RZ_READONLY
 666                 razf_end_flush(rz);
 667                 deflateEnd(rz->stream);
 668                 save_zindex(rz, rz->filedes);
 669                 if(is_big_endian()){
 670                         write(rz->filedes, &rz->in, sizeof(int64_t));
 671                         write(rz->filedes, &rz->out, sizeof(int64_t));
 672                 } else {
 673                         uint64_t v64 = byte_swap_8((uint64_t)rz->in);
 674                         write(rz->filedes, &v64, sizeof(int64_t));
 675                         v64 = byte_swap_8((uint64_t)rz->out);
 676                         write(rz->filedes, &v64, sizeof(int64_t));
 677                 }
 678 #endif
 679         } else if(rz->mode == 'r'){
 680                 if(rz->stream) inflateEnd(rz->stream);
 681         }
 682         if(rz->inbuf) free(rz->inbuf);
 683         if(rz->outbuf) free(rz->outbuf);
 684         if(rz->header){
 685                 free(rz->header->extra);
 686                 free(rz->header->name);
 687                 free(rz->header->comment);
 688                 free(rz->header);
 689         }
 690         if(rz->index){
 691                 free(rz->index->bin_offsets);
 692                 free(rz->index->cell_offsets);
 693                 free(rz->index);
 694         }
 695         free(rz->stream);
 696         close(rz->filedes);
 697         free(rz);
 698 }
 699
 700 #endif